package bit.lotterysystem.service.impl;


import bit.lotterysystem.common.utils.JacksonUtil;
import bit.lotterysystem.common.utils.RedisUtil;
import bit.lotterysystem.controller.param.DrawPrizeParam;
import bit.lotterysystem.controller.param.ShowWinningRecordsParam;
import bit.lotterysystem.dao.dataobject.*;
import bit.lotterysystem.dao.mapper.*;
import bit.lotterysystem.service.DrawPrizeService;
import bit.lotterysystem.service.dto.WinningRecordDTO;
import bit.lotterysystem.service.enums.ActivityPrizeStatusEnum;
import bit.lotterysystem.service.enums.ActivityPrizeTiersEnum;
import bit.lotterysystem.service.enums.ActivityStatusEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.*;
import java.util.stream.Collectors;

import static bit.lotterysystem.common.config.DirectRabbitConfig.EXCHANGE_NAME;
import static bit.lotterysystem.common.config.DirectRabbitConfig.ROUTING;

@Service
public class DrawPrizeServiceImpl implements DrawPrizeService {

    private static final Logger logger= LoggerFactory.getLogger(DrawPrizeServiceImpl.class);

    private final Long WINNING_RECORDS_TIMEOUT=60*60*24*2L;//保存两天

    private final String WINNING_RECORDS_PREFIX="WINNING_RECORDS_";

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private ActivityMapper activityMapper;

    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private PrizeMapper prizeMapper;
    @Autowired
    private WinningRecordMapper winningRecordMapper;
    @Autowired
    private RedisUtil redisUtil;

    @Override
    public void drawPrize(DrawPrizeParam param) {

        Map<String, String> map = new HashMap<>();
        map.put("messageId",String.valueOf(UUID.randomUUID()));
        map.put("messageData", JacksonUtil.writeValueAsString(param));
        //发消息:交换机、绑定的Key、消息体
        rabbitTemplate.convertAndSend(EXCHANGE_NAME,ROUTING,map);
        logger.info("mq消息发送成功，map={}",JacksonUtil.writeValueAsString(map));
    }

    /**
     * 出错条件：前端可能发送两个一样的请求
     * 以下方法的初始版本有Bug,在消耗最后一个奖项时，会被清空，原因是回滚了，所以不能抛出异常
     * @param param
     */
    @Override
    public Boolean checkDrawPrizeParam(DrawPrizeParam param) {
        ActivityDO activityDO = activityMapper.selectById(param.getActivityId());
        //奖品是否存在可以从activity_prize查看，因为保存activity做了本地事务，保证一致性。
        ActivityPrizeDO activityPrizeDO = activityPrizeMapper.selectByAPId(
                param.getActivityId(),param.getPrizeId()
        );
        //活动或奖品是否存在
        if(activityDO==null||activityPrizeDO==null){
            //throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_OR_PRIZE_IS_EMPTY);
            return false;
        }
        //活动是否有效
        if(activityDO.getStatus()
                .equalsIgnoreCase(ActivityStatusEnum.COMPLETED.name())){
            //throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_COMPLETED);
            return false;
        }
        //奖品是否有效
        if(activityPrizeDO.getStatus()
                .equalsIgnoreCase(ActivityPrizeStatusEnum.COMPLETED.name())){
//            throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_COMPLETED);
              return false;
        }
        //中奖者人数是否和设置奖品数量一致
        if(activityPrizeDO.getPrizeAmount()!=param.getWinnerList().size()){
//            throw new ServiceException(ServiceErrorCodeConstants.WINNER_PRIZE_AMOUNT_ERROR);
            return false;
        }

        return true;

    }

    @Override
    public List<WinningRecordDO> saveWinnerRecords(DrawPrizeParam param) {
        //查询相关信息：活动、人员、奖品、活动关联奖品
        ActivityDO activityDO=activityMapper.selectById(param.getActivityId());
        List<UserDO>userDOList=userMapper.batchSelectByIds(param.getWinnerList()
                .stream()
                .map(DrawPrizeParam.Winner::getUserId)
                .collect(Collectors.toList()));
        PrizeDO prizeDO=prizeMapper.selectById(param.getPrizeId());
        ActivityPrizeDO activityPrizeDO=
                activityPrizeMapper.selectByAPId(param.getActivityId(),param.getPrizeId());

        //构造中奖者记录、保存
        List<WinningRecordDO>winningRecordDOList=userDOList.stream()
                .map(userDO->{
                    WinningRecordDO winningRecordDO=new WinningRecordDO();
                    winningRecordDO.setActivityId(activityDO.getId());
                    winningRecordDO.setActivityName(activityDO.getActivityName());
                    winningRecordDO.setPrizeId(prizeDO.getId());
                    winningRecordDO.setPrizeName(prizeDO.getName());
                    winningRecordDO.setPrizeTier(activityPrizeDO.getPrizeTiers());
                    winningRecordDO.setWinnerId(userDO.getId());
                    winningRecordDO.setWinnerName(userDO.getUserName());
                    winningRecordDO.setWinnerEmail(userDO.getEmail());
                    winningRecordDO.setWinnerPhoneNumber(userDO.getPhoneNumber());
                    winningRecordDO.setWinningTime(param.getWinningTime());
                    return winningRecordDO;
                }).collect(Collectors.toList());
         winningRecordMapper.batchInsert(winningRecordDOList);

        //缓存中奖者信息
        //1.缓存奖品维度中奖记录(WinningRecord_activityId_prizeId,winningRecordDOList)
        cacheWinningRecords(param.getActivityId()+"_"+ param.getPrizeId(),
                winningRecordDOList,
                WINNING_RECORDS_TIMEOUT);

        //2.缓存活动维度中奖记录(WinningRecord_activityId,winningRecordDOList)
        //加前缀是为了区分ActivityImpl里的(ACTIVITY_activityId)
        //当活动完成后再去存放活动维度中奖记录
        if(activityDO.getStatus().equalsIgnoreCase(ActivityStatusEnum.COMPLETED.name())){
            //查询活动维度的全量中奖记录
            List<WinningRecordDO>allList=winningRecordMapper.selectByActivityId(param.getActivityId());
            cacheWinningRecords(String.valueOf(param.getActivityId()),
                    allList,
                    WINNING_RECORDS_TIMEOUT);


        }
        return winningRecordDOList;

    }

    @Override
    public void deleteRecords(Long activityId, Long prizeId) {
        //删除数据表
        if(activityId==null||prizeId==null){
            logger.warn("要删除中奖记录相关的活动id或奖品id为空!");
            return;
        }

        //删除数据表
        winningRecordMapper.deleteRecords(activityId,prizeId);

        //删除缓存（奖品维度、活动维度）
        if(null!=prizeId){
            deleteWinningRecords(activityId+"_"+prizeId);
        }
        deleteWinningRecords(String.valueOf(activityId));


    }

    @Override
    public List<WinningRecordDTO> getRecords(ShowWinningRecordsParam param) {
        //查询redis
        String key = null==param.getPrizeId()
                ?String.valueOf(param.getActivityId())
                :param.getActivityId()+"_"+param.getPrizeId();
        List<WinningRecordDO> winningRecordDOList=getWinningRecords(key);
        if(CollectionUtils.isEmpty(winningRecordDOList)){
            return convertToWinningRecordDTOList(winningRecordDOList);
        }
        //如果redis不存在，查库
        winningRecordDOList=winningRecordMapper.selectByActivityIdOrPrizeId(
                param.getActivityId(),param.getPrizeId());
        if(CollectionUtils.isEmpty(winningRecordDOList)){
            logger.info("查询的中奖记录为空！param:{}",JacksonUtil.writeValueAsString(param));
            return Arrays.asList();
        }
        //存放记录到redis
        cacheWinningRecords(key,winningRecordDOList,WINNING_RECORDS_TIMEOUT);
        return convertToWinningRecordDTOList(winningRecordDOList);
    }

    private List<WinningRecordDTO> convertToWinningRecordDTOList(List<WinningRecordDO> winningRecordDOList) {
        if(CollectionUtils.isEmpty(winningRecordDOList)){
            return Arrays.asList();
        }
        return winningRecordDOList.stream()
                .map(winningRecordDO -> {
                    WinningRecordDTO winningRecordDTO=new WinningRecordDTO();
                    winningRecordDTO.setWinnerId(winningRecordDO.getWinnerId());
                    winningRecordDTO.setWinnerName(winningRecordDO.getWinnerName());
                    winningRecordDTO.setPrizeName(winningRecordDO.getPrizeName());
                    winningRecordDTO.setPrizeTier(ActivityPrizeTiersEnum.forName(winningRecordDO.getPrizeTier()));
                    winningRecordDTO.setWinningTime(winningRecordDO.getWinningTime());
                    return winningRecordDTO;
                }).collect(Collectors.toList());
    }

    /**
     * 从缓存中删除中奖记录
     * @param key
     */
    private void deleteWinningRecords(String key){
        try{
            if(redisUtil.hasKey(WINNING_RECORDS_PREFIX+key)){
                redisUtil.del(WINNING_RECORDS_PREFIX+key);
            }
        }catch (Exception e){
            logger.error("删除中奖记录缓存异常,key:{}",key);
        }
    }

    /**
     * 缓存中奖记录
     * @param key
     * @param winningRecordDOList
     * @param time
     */
    private void cacheWinningRecords(String key,
                                     List<WinningRecordDO> winningRecordDOList,
                                     Long time) {

        String str="";
        try{
            if(!StringUtils.hasText(key)|| CollectionUtils.isEmpty(winningRecordDOList)){
                logger.info("要缓存的内容为空，key:{}，value:{}",WINNING_RECORDS_PREFIX+key,
                        JacksonUtil.writeValueAsString(winningRecordDOList));
                return;
            }
            str=JacksonUtil.writeValueAsString(winningRecordDOList);
            redisUtil.set(WINNING_RECORDS_PREFIX+key,
                    str,
                    time);
        }catch(Exception e){
            logger.error("缓存中奖记录异常！key:{},value:{}",WINNING_RECORDS_PREFIX+key,str);
        }

    }

    /**
     * 从缓存中获取中奖记录
     * @param key
     * @return
     */
    private List<WinningRecordDO> getWinningRecords(String key){
        try{
            if(!StringUtils.hasText(key)){
                logger.warn("要从缓存中查询的中奖记录key为空!");
                return Arrays.asList();
            }
            String str = redisUtil.get(WINNING_RECORDS_PREFIX + key);
            if(!StringUtils.hasText(str)){
                return Arrays.asList();
            }
            List<WinningRecordDO> winningRecordDOList =
                    JacksonUtil.readListValue(str, WinningRecordDO.class);
            return winningRecordDOList;
        }catch(Exception e) {
            logger.error("从缓存中查询中奖记录异常！key:{}",WINNING_RECORDS_PREFIX+key);
            return Arrays.asList();
        }

    }


}
